滨海盐碱地暗管排水除盐效果试验研究

Desalination of Subsurface Pipe Drainage in Saline-alkali Land of Coastal Areas

为探索山东滨海盐碱地暗管排水除盐效果，研究了3种不同暗管间距下地下水埋深变化和各土层土壤排水除盐效果。结果表明，暗管处理可有效控制地下水位，10、14、20m暗管间距的地下水埋深均满足作物生长要求，其中10m暗管间距地下水埋深始终最大；试验期间各暗管处理0～20、20～40cm土层土壤含盐量明显降低；10、14、20m暗管间距下，0～20cm土层土体脱盐率分别为59．4％、59．1％、56．5％，0～80cm土层土体脱盐率分别为21．6％、21．2％、19．7％．且均高于对照。推荐间距14m、埋深1．2m为山东滨海盐碱地暗管工程布设参数。

To explore the effects of subsurface pipe drainage on desalination in saline-alkali land of coastalareas in Shandong province, the changes of buried depth of groundwater and the desalination were studiedunder subsurface pipe drainage technology with three kinds of spacing. The results indicated that subsurface pipe drainage technology could effectively control the buried depth of groundwater, and buried depthsof groundwater all met the requirements of crop growth under subsurface pipe drainage technology withspacing of 10 m, 14 m and 20 m, of which the buried depth of groundwater was always the deepest withsubsurface pipe spacing of 10 m. Soil salt contents of 0-20 cm and 20-40 cm in depth were reduced significantly under subsurface drainage technology; Soil desalinationrates of 0-20 cm in depth were 59.4%,59.1% and 56.5% while soil desalination rates of 0-80 cm in depth were 21.6%, 21.2% and 19.7% under subsurface pipe technology with spacing of 10 m, 14 m and 20 m, and desalination rates under subsurface pipe drainage technology were higher compared to the control. Spacing of 14 m and buried depth of1.2 m were recommended as the parameters for saline-alkali land of coastal areas in Shandong province.